TINA/Spice/UCC28251: How to adjust the pre bias voltage when the control chip is on the two side?

shaowei cui

Part Number: UCC28251
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hello TI engineers!

I would like to ask some questions about how to use UCC28251, such as How to adjust the pre bias voltage when the control chip is on the two side?

and How to realize input under voltage protection?

your reply will be appreciate ,thanks.

regars

shaowei

over 5 years ago

0 Peter Meaney over 5 years ago

TI__Mastermind 31580 points

Hi Shaowei,

The input UVLO must be provided by a separate circuit. It will consist of a resistive divider chain, and a comparator with a reference which can be used to control enable pin.

If you read section 9.1.2.1 in the datasheet it describes the use of the VSENSE pin and by setting the resistive divider on the pin you can determine % of the output voltage ate which the controller comes out of pre-bais mode and starts to drive the SR's with full duty cycle.

Regards

Peter

0 shaowei cui over 5 years ago in reply to Peter Meaney

Intellectual 550 points

Thanks for your reply somuch!

Regards

shaowei

0 shaowei cui over 5 years ago in reply to Peter Meaney

Intellectual 550 points

Hi Peter,

Can you give me your e-mail address? Thanks to the forum, it's too slow. Thanks a lot.

Regards

shaowei

0 Peter Meaney over 5 years ago in reply to shaowei cui

TI__Mastermind 31580 points

Hi Shaowei,

The average response time on the forum is less than 24hrs, TI cannot offer direct support for customers outside of high volume manufacturers.

Regards

Peter

0 shaowei cui over 5 years ago in reply to Peter Meaney

Intellectual 550 points

Ok,Thank you very much as well.

0 shaowei cui over 5 years ago in reply to Peter Meaney

Intellectual 550 points

Hi Peter,

If I don't use the function of overcurrent protection,is it mean that the Ilim pin does not to be linked?

Regards

shaowei

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TINA/Spice/UCC28251: How to adjust the pre bias voltage when the control chip is on the two side?